263557131269 has 2 divisors, whose sum is σ = 263557131270. Its totient is φ = 263557131268.

The previous prime is 263557131193. The next prime is 263557131283. The reversal of 263557131269 is 962131755362.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258585471169 + 4971660100 = 508513^2 + 70510^2 .

It is a cyclic number.

It is not a de Polignac number, because 263557131269 - 2³² = 259262163973 is a prime.

It is a super-2 number, since 2×263557131269² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263557130269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131778565634 + 131778565635.

It is an arithmetic number, because the mean of its divisors is an integer number (131778565635).

Almost surely, 2^263557131269 is an apocalyptic number.

It is an amenable number.

263557131269 is a deficient number, since it is larger than the sum of its proper divisors (1).

263557131269 is an equidigital number, since it uses as much as digits as its factorization.

263557131269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 50.

The spelling of 263557131269 in words is "two hundred sixty-three billion, five hundred fifty-seven million, one hundred thirty-one thousand, two hundred sixty-nine".